Biped robot the balances dynamically using a human-like walking motion. It is a close relative to BigDog, sharing elements of the mechanical design and control.

PETMAN is an anthropomorphic robot for testing chemical protection clothing used by the US Army. Unlike previous suit testers, which had to be supported mechanically and had a limited repertoire of motion, PETMAN will balance itself and move freely; walking, crawling and doing a variety of suit-stressing calisthenics during exposure to chemical warfare agents. PETMAN will also simulate human physiology within the protective suit by controlling temperature, humidity and sweating when necessary, all to provide realistic test conditions.

Just watch and tell me that's not scary. Especially how it catches itself after being pushed at 0:25. I swear, you mount a couple machine guns on this thing, and presto, you've got yourself a real-life Terminator. Listen, Army -- you really want something to test your chemical protection suits on? I've got a whole neighborhood full of people I don't like. You think about it, I'll start marking doors.